Butcher Ghoul does not have a +1/+1 counter on it.
({1} magic symbol) available.
Steps
Activate Ghave's second ability by paying ({1} magic symbol) and sacrificing Butcher Ghoul.
Butcher Ghoul's undying ability triggers, returning Butcher Ghoul from your graveyard to the battlefield with a +1/+1 counter on it.
Butcher Ghoul enters the battlefield triggering Corpse Knight, causing each opponent to lose 1 life.
Resolve the Ghave ability, putting a +1/+1 counter on Cryptic Trilobite.
Activate Cryptic Trilobite by removing a +1/+1 counter from it, adding ({C} magic symbol) ({C} magic symbol) that can only be spent to activate abilities.
Activate Ghave's first ability by paying ({1} magic symbol) and removing a +1/+1 counter from Butcher Ghoul, creating a 1/1 Saproling creature token.
The Saproling token enters the battlfield triggering Corpse Knight, causing each opponent to lose 1 life.
Repeat.
Results
Infinite +1/+1 counters on creatures you control.
Infinite colorless mana that can only be spent to activated abilities.